This unique vibrator has an offset-weighted shaft on a DC motor. When motor is on, waves are generated along the attached string. String tension is controlled with the use of weights and a table-mounted pulley (not included). Output should be limited to 2 amps. Adjust voltage to change the wave pattern. Base has a clamping surface for either right-or left-handed operation. Two binding posts let you connect the 0 to 6 VDC power supply.